Heney doeeity



(No Model.) f

' H. DORRITY.

Grinding Mill.

No. 242,613. Patented June 7.1881.-

. Mlizeisses (jg myenzor U42 w l v I rran STATES PATENT I Pricee GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 242,613, dated June '7, 1881.

. Application filcdDecember20,18SO. (No model.)

To all whom tt may concern Be it known that I, HENRY DoRRiTY, of the city and county of New York, in the State of New York, have invented a certain new and useful ImprovementinGrinding-Mills,ofwhich the following is a specification.

My invention relates to mills for grinding paint and other substances,in which the upper stone is the runner, and its object is to provide for cooling the stones.

The invention consists in the combination of an upper rotary millstone having an internal cavity, an eye, and an annular groove in its upper surface, a stationary supply-pipe for supplying water to said annular groove, from whence it passes to said internal cavity, a spindle having a discharge-passage through it, and a pipe or passage within the eye of the stone for conducting water from said internal cavity to the discharge-passage in said spindle, and rotating with said stone and spindle, all as specifically hereinafter described.

In the accompanying drawings, Figure 1 represents acentral vertical section of a mill embodying my invention, and Fig. 2 represents a similar sectionof a mill embodying my invention in a slightly-modified form.

Similar letters of reference designate corresponding parts in both figures.

Although I have described the two grindin gsurfaces as stones, they may not be stone in fact, but may be composed of any other suitable material.

Referring first to Fig. 1, A designates the bed-stone placed upon supports B, and O designates the top stone or runner, which is rotated by means of a shaft or spindle, D. Upon the said shaft or spindle is fitted the usual bail, E, which fits in notches a in the stone 0, and b designates a driver or dog engaging with said bail. Thetop stone or runner, G, is constructed with an internal chamber or cavity, 0, around its eye (I, and, as here shown, the said chamber or cavity is formed by making the top stone in two sections or pieces, which are recessed upon their adjacent faces. Water is supplied to the chamber or cavity 0 by means of a stationary pipe, 6, which delivers the water into an annular channel, f, in the upper surface of the stone, from whence it passes through one ormore openings or ducts, j", to the chamber or cavity 0. The channel f is here shown as made in a separate piece from the stone, and its upper surface may form a tightjoint, g, with the contiguous part of the case F. Inasmuch as the water is delivered from the cavity 0 at the eye d of the stone, while the centrifugal force generated in the water by the rotation of the stone would tend to throw the water away from the center, it is obvious that the water must be introduced through the pipe 0 under a pressure sufficient to overcome the centrifugal force. lar groove f will therefore be filled with water under pressure, and the joint 9 must be sufficiently tight to prevent leakage under any pressure of water used.

The shaft or spindle D has within it a passage, h, and the water, after circulating through the chamber or cavity 0, is conducted through a pipe, 13, to the passage IL in the shaft or spindle. The pipet'should be arranged contiguous to the bail E, so that it will not offer any material obstacle to the introduction of substances to be ground through the eye (I.

The runner O and shaft or spindle D and appurtenances (shown in Fig. 2) are the same as those shown in Fig. 1, and above described, save that, instead of a pipe, 2', for conducting water from the chamber or cavity 0 to the passage h in the shaft or spindle D, I have shown a passage, 1', constructed in the bail E, which communicates with the passage Ii. through the top of the shaft or spindle D, and water is conducted from the chamber or cavity 0 to the passage t through a passage, 2', in the stone.

It may also be desirable to cool the bed-stone A, which is shown as constructed with an internal chamber or cavity, j, and in Fig. l I have shown means for conducting water from the passage h in the shaft or spindle to said chamber or cavity. As shown,the said passage terminates at the side of the shaft in a closed chamber, G, formed in two parts and bolted to the bed-stone A. The shaft or spindle passes through this chamber and is provided with a packing, is, above and below the same, to prevent leakage around the shaft.

H designates abush insertedin the bed-stone A, through which the shaft or spindle passes, and having an annular space, Z, between it and the stone. The water passes from the chamber G into this annular space, and thence through ducts or passages in into the chamber or eavity j, from whence it is delivered by a pipe, a,

The annuor other means. At the bottom of the ann ular'space l is a packing, 0, which prevents water from leaking down between the bush H and the stone.

In Fig. 2 I have shown the passage hin the shaft or spindle D as continued to a point be low the bed-stone A and terminating in a pipe, 1), through which water may be delivered into a pan, I. In this case the chamber or cavity j in the bed-stone A is supplied with water by a pipe, q, and exhausted through a second pipe, 0'.

I am aware that it is old to provide an upper stationary millstone and a lower rotary millstone with water-chambers, and to conduct the water from the chamber of the upper stationary stone to the chamber of the lower stone through a pipe entering the top of a hollow spindle and radial passages in the lower stone leading from said hollow spindle; but in this case said pipe is stationary and projects way above the upper stone, which would not be practicable if the upper stone were the runner.

I am aso aware that itis old to construct a mill with upper stationary and lower rotary millstones, each having an air-chamber, and to The combination of the upper rotary stone,

0, having the cavity or chamber 0, the eye d, and the annular groove f, the stationary supply-pipe e, the spindle D, having the dischargepassage h, and a pipe or passage within the eye (I, t'orconducting water from the cavityorchaniher 0 to the discharge-passage h, and rotating with said stone and spindle, substantially as herein specified.

HENRY DORRI'IY.

\Vitnesses FREDK HAYNEs, A. O. WEBB. 

